Design and comparison analysis of speed controllers for PMSM

Anti-disturbance speed control of low-speed high-torque PMSM based on second-order non-singular terminal sliding mode load observer

A new instantaneous torque-control strategy is presented for high-performance control of a permanent magnet (PM) synchronous motor. In order to deal with the torque pulsating problem of a PM synchronous motor in a low-speed region, new torque estimation and control techniques are proposed. The linkage flux of a PM synchronous motor is estimated using a model reference adaptive system technique, and the developed torque is instantaneously controlled by the proposed torque controller combining a variable structure control (VSC) with a space-vector pulse-width modulation (PWM). The proposed control provides the advantage of reducing the torque pulsation caused by the nonsinusoidal flux distribution. This control strategy is applied to the high-torque PM synchronous motor drive system for direct-drive applications and implemented by using a software of the digital signal processor (DSP) TMS320C30. The simulations and experiments are carried out for this system, and the results demonstrate the effectiveness of the proposed control.

Permanent magnet synchronous motors (PMSM) are mainly used in high-performance and high-efficiency motor drives such as used in railways. PMSM has the performance required for traction motors and is more compact, light weighted and efficient than induction motors. This paper presents the detailed modeling of PMSM drive in Simulink environment and also presents the speed control of PMSM using vector control approach and by use of state feedback (SFB) controller. The observer is designed to eliminate the need of sensors. The observer is designed for estimating any one of the state variable if the other state variable is known thus eliminating the need to sense both speed and current. The state feedback (SFB) controller is designed such to provide zero steady state error. For observation purpose a PI controller is also designed and the results of control actions have been compared and observed that SFB controller are more robust than PI controllers bpth in case of normal and over loading. In this paper, we have designed and simulated the mathematical model of PM synchronous motor and designed the state feedback control system using pole placement method and PI controller using bode plot method, for speed control of PMSM. The controller hence designed is found to be satisfactory and robust over wide range of operating condition and parameter variations.

This paper focuses on the speed control of a permanent magnet synchronous motor (PMSM), which is with uncertain external load disturbances. To promote the performance of PMSM speed loop, such as fast response, tracking accuracy and robustness, a sliding mode disturbance observer (SMDO) is proposed. The SMDO is used as a compensator, which is designed to estimate the lumped external disturbances and add a corresponding feedback compensation item to the output of the speed controller. Experiments and the corresponding results demonstrate that the proposed observer can guarantee a strong anti-disturbance capability of PMSM drive system, with improved speed tracking performance.

Aiming at the shortcomings of current permanent magnet synchronous motor control, such as electromagnetic torque pulsation, flux pulsation, poor anti-interference performance and slow response speed. This paper introduces the control method of high frequency injection optimization sliding mode permanent magnet synchronous motor. Through the establishment of PMSM vector mathematical model. The design is based on high frequency injection and optimized sliding mode controller, MATLAB/Simulink was used for modeling and simulation analysis. It turned out that Compared with the traditional high frequency injection method and sliding mode controller, the vector control of permanent magnet synchronous motor based on high frequency injection and optimized synovial controller has stronger anti-interference, better reduction of chattering, which can improve the characteristics of the system more effectively and meet the needs of actual motor control.

An optimal control system synthesis method is proposed which can achieve vector control and speed control simultaneously for permanent magnet synchronous motor (PMSM) drives. A state-space multiple-input multiple-output (MIMO) model for PMSM is developed, and the nonlinearities terms are discussed. Present methods of achieving vector control and servo control of PMSM are also discussed. A pseudolinearized PMSM model is obtained through state detection and an optimal speed controller is developed based on the pseudolinearized model. An integral control technique is incorporated to eliminate speed offsets. An observer is developed to eliminate the speed sensor in the drive. >

This paper is mainly focusing on the problem of speed tracking control for permanent magnet synchronous motor (PMSM) drive system subject to matched and mismatched disturbance. This is achieved by a novel Port-Controlled Hamiltonian control method with nonlinear disturbance observer. Different from the traditional speed-current cascade control for PMSM, the speed-current single loop controller is designed. Firstly, the Port-Controlled Hamiltonian model of PMSM is established, then the Hamiltonian speed controller is designed by using interconnection assignment and damping assignment method. However, the standard Hamiltonian controller cannot achieve the satisfying behavior in the presence of the parameter variations and external disturbance, thus a nonlinear disturbance observer is designed to estimate the lump disturbance of the system, which is used to the feed-forward compensation control. Finally, simulation and experiment on the speed control system of PMSM are implemented. The results show that the proposed method has fast speed control performance and strong robustness for the different disturbance.

Permanent Magnet Synchronous Motors (PMSM) have found widespread acceptance industrially. Vector control of PMSM allows for torque-speed decoupling, which is an important requirement in variable speed drives. This paper attempts to enhance the dynamic characteristics of a PMSM drive by replacing its speed PI controller. PI controllers usually satisfy most industrial requirements, but they are susceptible to variations in plant parameters. A fuzzy speed controller is identified as an alternative and is designed and implemented to replace the PI Speed controller. An improvement is observed in the dynamic characteristics, stability, and robustness. These tests have been performed on the Microsemi SmartFusion <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">®</sup> platform using a reference design that uses a PI controller, which is available from its website. Currently, efforts are on to evaluate the effect of using a Fuzzy logic-based current controller in the PMSM drive.

The development of electric and hybrid vehicles has gained increasing attention in recent years. This paper proposes an Electric drive for Hybrid vehicles application and its control strategy to achieve a wide speed range. In these vehicles, important requirements for the electric drive are low weight, small volume, high efficiency and low cost. When choosing the motor for the vehicle drive, the induction motor is an obvious alternative but a permanent magnet synchronous motor (PMSM) can offer advantages in terms of higher efficiency and specific power. In this paper a permanent magnet synchronous machine (PMSM) is used as an electric drive machine. The operation of a PMSM above the base speed is possible by weakening the permanent-magnet excitation by a demagnetizing field component supplied by the stator winding. This can be done by closed loop operation of PMSM. The speed and torque control of the PMSM drive used as hybrid vehicle is controlled by proper tuning the PI controllers. A three level diode clamped inverter using IGBT's has simulated, whose switching sequences are controlled by Space Vector Pulse Width Modulation (SVPWM). A mathematical model of PMSM drive suitable for hybrid vehicle has simulated and proper closed loop control is established by field oriented control method. The entire work is done in MATLAB/SIMULINK.

In order to improve the anti-disturbance performance of permanent magnet synchronous motor (PMSM) servo system, a sliding-mode control strategy using a new reaching law (NRL) is proposed. The NRL incorporates power term and switching gain term of the system state variables into the conventional exponential reaching law (CERL), which can effectively suppress the sliding-mode chattering and increase the convergence rate of system state reaching sliding-mode surface. Based on this new reaching law, a sliding-mode speed controller (SMSC) of PMSM is designed. At the same time, to solve the chattering problem caused by the large sliding-mode switching gain, an anti-disturbance sliding-mode speed controller method with an extended sliding-mode disturbance observer (ESMDO), called SMSC+ESMDO method, is developed. The sliding-mode disturbance observer is designed to accurately estimate the motor speed and external load disturbances, and the disturbance estimator is used as a feed-forward to compensate the sliding-mode speed controller (SMSC) to improve the system robustness and reduce the system chattering. Simulation and experimental results show that the proposed compound sliding-mode control strategy can effectively improve the dynamic performance and robustness of the system compared with the PI controller.

Permanent Magnet Synchronous Motor (PMSM) can behave chaotically for a certain range of its parameters. To improve its dynamical behavior and enable a robust control of the rotor angular speed, a novel method combining the wavelet transform with the filtered-x LMS algorithm is presented in this paper. Without linearizing the model so as to not advertently misinterpret the underlying dynamics, the method can identify the nonlinear PMSM model with adaptive filters in real-time and guarantee a comprehensive control in both the time and frequency domains. Firstly, the physical PMSM model is analyzed and its chaotic behavior without control is investigated. The wavelet-based filtered-x LMS is then applied to the nonlinear PMSM system subject to desired angular speeds that are constant and varying harmonically in time. Numerical studies show that chaotic behaviors are effectively mitigated and the system output matches the desired angular speed after the initial transient period, thus demonstrating the feasibility of the method for the control of PMSMs.

Introduction. This study introduces a sliding mode control (SMC) that utilizes multivariable system command estimation (MSCE-SMC) to create an innovative speed control system for the permanent magnet synchronous motor (PMSM). The motor operates through a 3-phase voltage source inverter when used in an electric vehicle (EV) model, with the goal of achieving fast speed regulation and high performance. Problem. The primary challenge is to achieve fast and accurate speed regulation for PMSMs while maintaining high performance, despite varying system parameters and external disturbances. The goal is to design a robust and adaptive speed control system for PMSMs using the SMC approach, which ensures precise speed tracking and high-performance regulation. Scientific novelty. The integration of MSCE-SMC approach, offering an innovative solution for speed control in PMSMs used in EVs. Methodology. SMC approach for the PMSM divides the system into 2 subsystems: electrical and speed. A d-q coordinate frame is used to model the PMSM, and its control strategy is outlined. A detailed model of the PMSM with SMC is presented after an in-depth review of the theoretical concepts and principles of sliding mode control. Results. To validate the proposed approach, MATLAB/Simulink is conducted, demonstrating the effectiveness and robustness of the method in PMSM speed regulation. The results confirm that the proposed method provides straightforward and precise control, accurate speed tracking, and high-performance regulation. It also shows adaptability to parameter variations and external disturbances. Practical value. The practical value of the proposed method is significant, as it provides a reliable and efficient control system for PMSMs. It offers precise speed control, robust performance under variable conditions, and high adaptability to external disturbances, making it suitable for real-world EV applications. References 22, table 1, figures 18.

This paper presents a high performance ZPE(zero-phase-error) speed controller for PMSM(permanent magnet synchronous motor) drives. A comparison study between conventional general purpose speed controller in modern industry fields such as PI, IP and 2-degree of freedom controller presented also. The proposed ZPE speed controller is found suitable for vector controlled PMSM drives in giving the high level of performance while maintaining the excellent response at the time of speed command changing. In MATLAB-based comparative simulation and experiment results with commercial drive system, the proposed method shows a superior control performance compared with the conventional speed controller widely-used.

The direct torque control theory has achieved great success in the control of permanent magnet synchronous motor. A Direct Torque Control (DTC) scheme of Permanent Magnet Synchronous Motor (PMSM) is presented. Based on in-depth analysis of PMSM mathematical model in abc frame and  frame are established and the operation principle of DTC-SVPWM system, the relationships between the torque and fundamental components. A novel space vector pulse width modulation (SVPWM) method which has a feature of low harmonic is proposed. The proposed method is adopted to implement the direct torque control (DTC) of a three-phase PMSM. A large number of simulation results show that the DTC System of PMSM has fast response and good dynamic performance. Aiming at the direct torque control in PMSM Drives, in this paper explained the theoretical basis of the direct torque control (DTC) for PMSM firstly. Then explained the difference between the applications of DTC-SVPWM to PMSM. Finally the MATLAB/Simulink models were developed to examine the DTC- SVPWM for PMSM. The simulation results is presented in this paper.

The Permanent Magnet Synchronous Motor (PMSM) is widely used in many fields. Aiming at nonlinearity, strong coupling and uncertainty of the PMSM, this paper proposes a nonlinear multi-input multi-output (MIMO) decoupling PMSM algorithm based on Active Disturbance Rejection Control (ADRC). A Lower-Upper matrix factorization approach is introduced to solve a general inverse of the measured time-varying matrix in real-time decoupling ADRC. This PMSM is based on the vector control. First, the PMSM model and vector control are simulated. Then, a first-order ADRC is introduced and used to replace the PID controller in the d and q axis of PMSM respectively. The simulation shows that the replaced system has a smaller fluctuation, faster response and better stability. Finally, the nonlinear MIMO decoupling ADRC and its inverse matrix method are deduced. Then, the decoupling PMSM control based on ADRC is verified. The simulation shows that this system has a better static and dynamic performance, and it conforms to the PMSM characteristics better. All this shows that the nonlinear MIMO decoupling ADRC is a better strategy for the PMSM. The presented algorithm also has advantage in method compared with some recent results of decoupling PMSM control.